Elastic and electron capture processes in slow He+-He collision

Superelastic and inelastic He2++He state-selective electron capture.

Scattering resonances in slow NH3-He collisions.

We theoretically study slow collisions of NH(3) molecules with He atoms, where we focus in particular on the observation of scattering resonances. We calculate state-to-state integral and differential cross sections for collision energies ranging from 10(-4) cm(-1) to 130 cm(-1), using fully converged quantum close-coupling calculations. To describe the interaction between the NH(3) molecules a...

Electron capture, collision-induced, and electron capture-collision induced dissociation in Q-TOF.

Recently, we demonstrated that a radio-frequency-free electromagnetostatic (rf-free EMS) cell could be retrofitted into a triple quad mass spectrometer to allow electron-capture dissociation (ECD) without the aid of cooling gas or phase-specific electron injection into the cell (Voinov et al., Rapid Commun Mass Spectrom 22, 3087-3088, 2008; Voinov et al., Anal Chem 81, 1238-1243, 2009). Subsequ...

Cold-target recoil-ion-momentum spectroscopy study of single electron capture from He by slow Ar ions

Cold-target recoil-ion-momentum spectroscopy ~COLTRIMS! has been used to study single electron capture from He by Ar ions at projectile velocities between 0.2 and 1.0 a.u. Populations of 3d through 7l states on the final ion are resolved, and angular distributions are presented for separated major final channels. As the projectile velocity is raised, the reaction window is observed to spread. C...

Atomic - orbital expansion study for the ( quasi - ) two - electron collision systems 06 + He and C 6 + +

The atomic-orbital expansion method within the close-coupling scheme is extended to two-electron collision systems. Coupling matrix elements are evaluated with full account of electron exchange and translation. Results are presented for one-electron capture in the (quasi-)two-electron systems 0 6 + + H e and C6++He in the energy range 0.540 keV amu-' where a one-electron potential model descrip...